Flask



FIG. 1 is a front side view of the flask in accordance with our newdesign;

FIG. 2 is a right side view thereof;

FIG. 3 is a back side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom view thereof.

CLAIM The ornamental design for a flask, as shown and described.